PyYAML: Ticket #169: PyYAML fails to load mapping keys of sequence typehttp://pyyaml.org/ticket/169
<p>
The following YAML code is taken directly from an example given in the YAML 1.1 specification and fails to load with PyYAML, giving the error message: <tt>found unacceptable key (unhashable type: 'list')</tt>.
</p>
<pre class="wiki">---
? - Detroit Tigers
- Chicago cubs
:
- 2001-07-23
? [ New York Yankees,
Atlanta Braves ]
: [ 2001-07-02, 2001-08-12,
2001-08-14 ]
...
</pre><p>
The problem most likely arises because Python lists are not hashable and cannot be used as dict keys. A possible solution may be to detect this special case and coerce YAML !!seq types to Python tuples before constructing the dictionaries that they are a part of.
</p>
en-usPyYAML/static/pyyaml.pnghttp://pyyaml.org/ticket/169
Trac 0.12.2xiMon, 11 Oct 2010 06:01:58 GMTstatus, description changed; resolution sethttp://pyyaml.org/ticket/169#comment:1
http://pyyaml.org/ticket/169#comment:1
<ul>
<li><strong>status</strong>
changed from <em>new</em> to <em>closed</em>
</li>
<li><strong>resolution</strong>
set to <em>wontfix</em>
</li>
<li><strong>description</strong>
modified (<a href="/ticket/169?action=diff&amp;version=1">diff</a>)
</li>
</ul>
<p>
Using PyYAML API, you could provide a custom loader for <tt>!!dict</tt> nodes that handles this case in an application-specific way. However I think raising an error is a sane default behavior.
</p>
TicketanonymousSun, 01 Apr 2012 20:24:42 GMThttp://pyyaml.org/ticket/169#comment:2
http://pyyaml.org/ticket/169#comment:2
<p>
As it's a bit tricky at first to get this stuff working, I figured I'd share my solution. I'm assuming you occasionally have keys with sequences and want the keys to convert to tuples, here's <a class="ext-link" href="https://github.com/scooby/yaml_examples/blob/master/handle_mappings.py"><span class="icon"> </span>one way to do it</a>.
</p>
<p>
Most of what I'm really working at is figuring out how the tags work. For a lot of applications, the right way to handle mappings is through custom ADTs where you specify exactly what it means for A to map to B in a reproducible manner.
</p>
<p>
For a lot of the YAML use cases, you might even go so far as to simply make all values map to immutable types. (A standard 'frozendict' would be a big help here.)
</p>
TicketRichardmnThu, 03 Jul 2014 13:26:37 GMThttp://pyyaml.org/ticket/169#comment:3
http://pyyaml.org/ticket/169#comment:3
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TicketRichardmnSat, 05 Jul 2014 14:45:02 GMThttp://pyyaml.org/ticket/169#comment:4
http://pyyaml.org/ticket/169#comment:4
<p>
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TicketRichardmnThu, 10 Jul 2014 04:36:23 GMThttp://pyyaml.org/ticket/169#comment:5
http://pyyaml.org/ticket/169#comment:5
<p>
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TicketRichardKewSat, 12 Jul 2014 02:37:06 GMThttp://pyyaml.org/ticket/169#comment:6
http://pyyaml.org/ticket/169#comment:6
<p>
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TicketRichardKewMon, 14 Jul 2014 18:40:18 GMThttp://pyyaml.org/ticket/169#comment:7
http://pyyaml.org/ticket/169#comment:7
<p>
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TicketRichardmnWed, 16 Jul 2014 10:43:11 GMThttp://pyyaml.org/ticket/169#comment:8
http://pyyaml.org/ticket/169#comment:8
<p>
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TicketRichardKewMon, 21 Jul 2014 01:12:42 GMThttp://pyyaml.org/ticket/169#comment:9
http://pyyaml.org/ticket/169#comment:9
<p>
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TicketFrancisOiSun, 27 Jul 2014 14:58:58 GMThttp://pyyaml.org/ticket/169#comment:10
http://pyyaml.org/ticket/169#comment:10
<p>
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